Vehicle restraining device

ABSTRACT

A vehicle restraint apparatus is for restraining a vehicle  1  on one or more rollers  7  of a vehicle test system. The vehicle restraint apparatus  11  includes a pair of vehicle restraining jigs whose first ends are joined with left and right seatbelt fixing pillars  2  of the vehicle  1 , respectively, and whose second ends are joined with left and right poles  10  on a floor, respectively.

TECHNICAL FIELD

The present invention relates to a vehicle restraint apparatus or vehicle restraining device for restraining or binding a vehicle in a vehicle test system such as a chassis dynamometer performing tests for fuel consumption, exhaust gases etc. of the vehicle mounted on one or more rollers.

BACKGROUND ART

A vehicle restraining apparatus of a type as shown in FIG. 33 is arranged to restrain a vehicle 102 having tires 102 a on rollers 106 of chassis dynamometer 105 by using chains or wire ropes 101 so that first ends 101 a of wire ropes 101 are connected with vehicle 102 and second or opposite ends 101 b of wire ropes 10 a are connected with poles 104 installed on a floor 103 (Patent documents 1, 2, for example).

Moreover, a vehicle restraining device 112 as shown in FIGS. 34(A) and 34(B) is under development. This vehicle restraining device 112 is arranged to slide along a rail 111, and to restrain a vehicle 116 with arm 114 which is supported by a arm support portion 113 of the vehicle restraining device 112, and which extends to a forward end portion provided with an adapter 115 fit in an adapter receiving portion 118 formed in a chassis 117 of the vehicle 116 to connect and restrain the vehicle (Patent Document 3, for example).

In a vehicle running on an actual road, the vertical load applied to each tire varies in dependence on the acceleration/deceleration. In the case of the chassis dynamometer, by contrast, each degree of freedom of the vehicle is restrained and hence the vertical loads vary differently from the running condition on the actual road.

Between the running motion on the actual road and the running motion on the chassis dynamometer, the difference in the vehicle pitching motion causes a difference in the application of vertical loads, and exerts influence on the results of a test. Since the accuracy of the vehicle performance test is adversely influenced by the difference in changes in the vertical loads, it is required to reproduce the behavior of vehicle pitching motion.

In the case of the vehicle restraining apparatus using the chains or wire ropes 101 as shown in FIG. 33, the tires 102 a of vehicle 102 are pressed on the rollers 106 by the chains or wire ropes 101, and therefore, the reproduction of the behavior of vehicle pitching motion is difficult.

The vehicle restraining apparatus of Patent document 3 is arranged to restrain the vehicle with the vehicle restraining device 112 which is movable on the rail 111 and which includes the adapter 115 inserted in the adapter receiving portion 118 formed in the chassis 117 of vehicle 116. Therefore, the reproduction of the vehicle pitching behavior is easier because the tires are not pressed on the rollers by the chains or wire ropes 101 as in Patent Documents 1 and 2. However, the vehicle restraining apparatus of Patent Document 3 encounters the following problems.

(1) The adapter receiving portion is generally formed in a side sill in the bottom of the vehicle, so that the application is difficult to vehicles having no side sills. For vehicles having no side sills, it is required to fix an attachment formed with the adapter receiving portion, to the bottom of the vehicle.

(2) The adapter receiving portion is required to be rigid enough for safety aspect. However, the side sills are not always rigid enough in the whole of the vehicle.

(3) The positions of side sills are away from the center of gravity of the vehicle, and the center of gravity of the vehicle is not restrained. Therefore, the vehicle pitching motion is varied differently from the actual behavior on the road.

The present invention has been devised to solve these problems.

PRIOR ART DOCUMENTS Patent Documents

Patent Document 1: JPH10-307082U

Patent Document 2: JP2007-212154A

Patent Document 3: JP2011-033517A (cf. paragraph [0002]˜paragraph [0005] and FIGS. 6 and 7)

Patent Document 4: JPH01-279131A

Patent Document 5: JPH10-67376A

Patent Document 6: JPS64-83743A

Patent Document 7: JP2001-80583A

Patent Document 8: JPH02-118849U

Patent Document 9: JPH01-167642U

SUMMARY OF THE INVENTION

According to the present invention, a vehicle restraint apparatus to restrain a vehicle on one or more rollers of a vehicle test system or test equipment, comprises a pair of vehicle restraining jigs whose one ends are linked or joined with left and right seatbelt fixing pillars of the vehicle and whose other ends are linked or joined with left and right poles on a floor.

According to the present invention, the one ends of vehicle restraining jigs are connected with the vehicle's seatbelt fixing pillars which are required to be rigid enough due to the nature of the pillars for holding the seatbelts. Therefore, it is possible to reproduce the vehicle pitching behavior and to restrain the vehicle reliably and firmly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1(A) is a schematic side view showing seatbelt fixing pillars of a vehicle, FIG. 1(B) is a schematic plan view showing the pillars, and FIG. 1(C) is an enlarged view showing a main portion of one of the pillars.

FIGS. 2(A) and 2(B) are schematic side view and schematic plan view of a vehicle restraint apparatus according to a first embodiment of the present invention, provided with a test vehicle.

FIGS. 3(A), 3(B) and 3(C) are views for illustrating one example of a mode of attaching the vehicle restraining jigs to the seatbelt fixing pillars in the first embodiment.

FIGS. 4(A) and 4(B) are schematic side view and schematic plan view of a vehicle restraint apparatus according to a second embodiment of the present invention, provided with a test vehicle.

FIGS. 5(A) and 5(B) are schematic side view and schematic plan view of a vehicle restraint apparatus according to a third embodiment of the present invention, provided with a test vehicle.

FIG. 6 is a side view of a first link mechanism according to the third embodiment.

FIG. 7 is a plan view of the first link mechanism according to the third embodiment.

FIG. 8 is a sectional view of a shaft portion of the first link mechanism according to the third embodiment.

FIG. 9 is a side view showing a second link mechanism according to the third embodiment and a length adjusting mechanism.

FIG. 10(A) is a schematic side view of a vehicle restraint apparatus according to a fourth embodiment, provided with a test vehicle, and FIG. 10(B) is a schematic plan view of this vehicle restraint apparatus with an enlarged view of the first link mechanism.

FIG. 11 is a schematic rear view of the vehicle restraint apparatus according to the fourth embodiment.

FIGS. 12(A) and 12(B) are schematic side view and schematic plan view of a vehicle restraint apparatus according to a fifth embodiment of the present invention, provided with a test vehicle.

FIGS. 13(A) and 13(B) are schematic side view and schematic plan view of a vehicle restraint apparatus according to a sixth embodiment of the present invention, provided with a test vehicle.

FIGS. 14(A) and 14(B) are schematic side view and schematic plan view of a vehicle restraint apparatus according to a seventh embodiment of the present invention, provided with a test vehicle.

FIGS. 15(A), 15(B) and 15(C) are views for illustrating one example of the mode of attaching the vehicle restraining jig to the seatbelt fixing pillar in an eighth embodiment.

FIGS. 16(A) and 16(B) are schematic side view and schematic rear view of a vehicle restraint apparatus according to the eighth embodiment, provided with a test vehicle.

FIGS. 17(A), 17(B) and 17(C) are views for illustrating one example of the mode of attaching the vehicle restraining jig to the seatbelt fixing pillar in the eighth embodiment.

FIGS. 18(A) and 18(B) are schematic side view and schematic rear view of a vehicle restraint apparatus according to the eighth embodiment, provided with a test vehicle.

FIGS. 19(A), 19(B) and 19(C) are views for illustrating one example of the mode of attaching the vehicle restraining jig to the seatbelt fixing pillar in the eighth embodiment.

FIGS. 20(A) and 20(B) are schematic side view and schematic rear view of a vehicle restraint apparatus according to the eighth embodiment, provided with a test vehicle.

FIGS. 21(A), 21(B) and 21(C) are views for illustrating one example of the mode of attaching the vehicle restraining jig to the seatbelt fixing pillar in the eighth embodiment.

FIGS. 22(A) and 22(B) are schematic side view and schematic rear view of a vehicle restraint apparatus according to the eighth embodiment, provided with a test vehicle.

FIGS. 23(A) and 23(B) are views for illustrating one example of the mode of attaching the vehicle restraining jig to the seatbelt fixing pillar in a ninth embodiment.

FIG. 24(A) is a view illustrating the state of the vehicle restraining jig attached to the seatbelt fixing pillar in the ninth embodiment, and FIG. 24(B) is a schematic side view of a vehicle restraint apparatus according to the ninth embodiment, provided with a test vehicle.

FIGS. 25(A) and 25(B) are schematic side view and schematic rear view of a vehicle restraint apparatus according to the ninth embodiment, provided with a test vehicle.

FIG. 26 is a view illustrating the state of the vehicle restraining jig attached to the seatbelt fixing pillar in the ninth embodiment.

FIGS. 27(A) and 27(B) are schematic side view and vertical sectional view of a deflection absorbing mechanism according to a tenth embodiment.

FIGS. 28A and 28(B) are schematic side view and vertical sectional view of a deflection absorbing mechanism according to the tenth embodiment.

FIG. 29 is a view for illustrating the state of the deflection absorbing mechanism and a vibration damping device attached to the vehicle restraining jig.

FIGS. 30(A) and 30(B) are schematic side views of a vibration damping devices according to an eleventh embodiment.

FIGS. 31(A) and 31(B) are schematic side view and schematic plan view of a lateral vibration suppressing mechanism in a vehicle restraint apparatus according to a twelfth embodiment with a test vehicle.

FIG. 32 is a schematic rear view of the lateral vibration suppressing mechanism according to the twelfth embodiment.

FIG. 33 is a view for illustrating a conventional example.

FIG. 34(A) is a perspective view showing another conventional example, and FIG. 34(B) is a sectional view showing an adapter and an adapter receiving portion of the vehicle restraint apparatus.

MODE(S) FOR CARRYING OUT THE INVENTION

Before explanation on a vehicle restraint apparatus according to the present invention, explanation is briefly directed to a vehicle using the vehicle restraint apparatus or device according to the present invention.

FIGS. 1(A) and 1(B) are schematic side view and schematic plan view of a vehicle 1 using the vehicle restraint apparatus according to the present invention.

The vehicle 1 includes seatbelt fixing pillars 2 at the side of doors, respectively. Each seatbelt fixing pillar 2 is a pillar to which a seatbelt is attached or anchored.

As shown in FIG. 1(C), upper and lower seatbelt fixing portions 4 and 5 are fastened to upper and lower end portions of the seatbelt fixing pillar 2 by a plurality of screw fasteners 3. Upper and lower ends of the seatbelt are attached to the upper and lower seatbelt fixing portions 4 and 5, respectively. In FIGS. 1(A) and 1(B), a reference numeral 6 represents the position of center of gravity of the vehicle.

First Embodiment

FIGS. 2(A) and 2(B) are schematic side view and schematic plan view of a vehicle 1 held by using a vehicle restraint apparatus or device 11 according to a first embodiment.

The vehicle restraint apparatus 11 includes a pair of vehicle restraining jigs or tools 12, 12 each of which includes a first end joined with one of the left and right seatbelt fixing pillars 2 of the vehicle 1 having tires 8 mounted on rollers 7 of a chassis dynamometer, and a second end joined with one of left and right poles 10 standing on a floor 9.

Vehicle restraining jigs 12, 12 are made of material having tensile strength and compression strength required for restraining longitudinal movement or forward/rearward movement of the vehicle, such as plate, sheet or pipe of steel or other material having a superior mechanical strength. Each of vehicle restraining jigs 12, 12 is provided with a length adjusting mechanism 13, such as a turnbuckle, capable of adjusting the length of the jig in accordance with the vehicle length, at a position near one end of the jig. A tie rod 14 connecting the left and right vehicle restraining jigs 12, 12 is provided in a central portion in the lengthwise direction of the jigs. Tie rod 14 is provided with a length adjusting mechanism 15, such as a turnbuckle, for adjusting the spacing between the vehicle restraining jigs 12, 12 in accordance with the vehicle width, at a central portion in the lengthwise direction of the tie rod.

The first ends, in the lengthwise direction, of vehicle restraining jigs 12, 12 are, respectively, joined rotatably to the seatbelt fixing pillars 2 through a first link mechanism 16. The second ends, in the lengthwise direction, of vehicle restraining jigs 12, 12 are, respectively, joined rotatably to the poles 10 through a second link mechanism 17.

As shown in FIG. 2(A), the first link mechanism 16 is attached to an inside surface 2 a of the seatbelt fixing pillar 2 on each side so that a shaft 18 is located at a position in the vicinity of the vehicle center of gravity 6. A shaft 21 of the second link member 17 is attached to the pole 10 on each side at a position approximately equal in height to the vehicle center of gravity 6. The position in the vicinity of the vehicle center of gravity 6 is a position set as close as possible to the vehicle center of gravity 6.

As shown in FIG. 3, the first link mechanism 16 includes the shafts 18, bearing members or shaft receiving members 19, respectively, supporting the shafts 18 rotatably, and attaching member (hereinafter referred to as pillar mount member) 20 for attaching the bearing members 19 to the inside surfaces 2 a of seatbelt fixing pillars 2.

The first link mechanism 16 connects the first ends, in the lengthwise direction, of vehicle restraining jigs 12, 12, rotatably to the inside surfaces 2 a of seatbelt fixing pillars 2, with the shafts 18, bearing members 19 and pillar mount members 20.

The pillar mount members 20 are formed in the shape of a long plate conforming to the seatbelt fixing pillars 2 and attached or fixed to the inside surfaces 2 a of seatbelt fixing pillars 2 in place of the seatbelt fixing portions 4 and 5.

The second link mechanism 17 includes the shafts 21 disposed, respectively, at the second ends of the vehicle straining jigs 12 and bearing members or shaft receiving members 22. The vehicle restraining jigs are attached to the poles 10 through the bearing members 22, respectively.

One example of the method of fixing the vehicle restraining jigs 12 to the seatbelt fixing pillars 2 is explained with reference to FIGS. 3(A), 3(B) and 3(C).

In this example, first, the first end of each of left and right vehicle restraining jigs 12, 12 is attached to the central portion of pillar mount member 20 through the shaft 18 and the bearing member 19, as shown in FIG. 3(A). On the other hand, the seatbelt fixing portions 4, 5 are removed from the seatbelt fixing pillar 2.

Then, as shown in FIGS. 3(B) and 3(C), the pillar mount member 20 is fastened to the inside surface 2 a of seatbelt fixing pillar 2 on each side. This operation of fixing the pillar mount member 20 to seatbelt fixing pillar 2 is performed by superimposing threaded holes 24 of pillar mount member 20 on threaded holes 23 of seatbelt fixing pillar 2 and screwing screw fasteners 25 into the superimposed holes 23, 24. In FIG. 3(C), a reference numeral 26 represents a frame of the vehicle, a reference numeral 27 represents the interior of the vehicle, and a reference numeral 28 represents the exterior of the vehicle.

At the time of usage of the thus-constructed vehicle restraint apparatus 11 of the first embodiment, first the vehicle 1 is mounted on the rollers 7 of the chassis dynamometer as shown in FIG. 2, the first ends of vehicle restraining jigs 12 are linked with the seatbelt fixing pillars 2, respectively, through the first link mechanism 16, and the shafts 16 of first link mechanism 16 are positioned in the vicinity of the center of gravity 6 of the vehicle. On the other hand, the second ends of vehicle restraining jigs 12 are attached to the poles 10 through second link mechanism 17, and the shafts 21 of second link mechanism 17 are set at positions whose heights are substantially equal to the height of vehicle center of gravity 6 by adjusting the heights of poles 10, so that the vehicle restraining jigs 12 are held substantially horizontal.

Then, vehicle 1 is restrained by left and right vehicle restraining jigs 12, the rollers 7 are rotated and various test of vehicle 1 are performed.

The first ends of vehicle restraining jigs 12 are connected with the seatbelt fixing pillars 2 having a high rigidity. Therefore, the vehicle restraint apparatus can hold or restrain the vehicle firmly and securely with the vehicle restraining jigs 12.

Furthermore, because of the structure joining the first ends of vehicle restraining jigs 12 rotatably through first link mechanism 16 to the seatbelt fixing pillars 2 in the vicinity of vehicle center of gravity 6 and joining the second ends of vehicle restraining jigs 12 rotatably through second link mechanism 17 to the poles 10 at the heights substantially equal to the height of center of gravity 6, the vehicle (translational) longitudinal motion is restrained but the vehicle (rotational) pitching motion and the vehicle (translational) vertical motion are left free. Therefore, this structure enables the realization of vehicle behavior similar to the vertical or normal load on an actual road. Since the vertical load applied to each tire is matched to the traveling state including the accelerating and decelerating states, this vehicle restraint apparatus enables the tests including test of fuel consumption by mode operations, exhaust gas test and vehicle performance test.

Moreover, it is possible to adjust the length of each vehicle restraining jig 12 in dependence on the length of the vehicle 1, with the length adjusting mechanism 13 capable of adjusting the length of the vehicle restraining jig 12.

The positions of poles 10 are adjustable in at least one of the vehicle width direction and the vehicle length direction. Therefore, the vehicle restraint apparatus is applicable to vehicles of a variety of sizes, by adjusting the vehicle restraining jigs 12 in accordance with the width, length etc. of the vehicle 1.

Second Embodiment

FIG. 4 shows a second embodiment. In this embodiment, there is provided, between the second link mechanism 17 and poles 10 in the mode of the first embodiment, one or more restraining force sensors 29 which are arranged to sense a restraining force of the vehicle. The positions of restraining force sensors 29 are not limited to the region between second link mechanism 17 and poles 10. Restraining force sensors 29 may be provided at positions between vehicle restraining jigs 12 and second link mechanism 17, positions between first link mechanism 16 and seatbelt fixing pillars 2, or some other positions capable of securely sensing the restraining force of restraining vehicle 1. The vehicle restraint apparatus 11 of this embodiment capable of sensing the vehicle restraining force makes it possible to measure, analyze and evaluate the vehicle sprung characteristics, in addition to the effects of the first embodiment.

Third Embodiment

FIGS. 5˜9 show a third embodiment. In this embodiment, as shown in FIG. 5, a first link mechanism 31 joining the first ends of vehicle restraining jigs 12 rotatably with the seatbelt fixing pillars 2 includes tubular shaft portions 32 to which the first ends of vehicle restraining jigs 12 are, respectively, attached rotatably, and shaft supporting arms 33 attaching the shaft portions 32 to the seatbelt fixing pillars 2, respectively.

As shown in FIGS. 6˜8, the shaft supporting arms 33 are T-shaped members shaped like a letter T. The shaft portion 32 is provided in a second end of each shaft supporting arm 33, and a first end portion of shaft supporting arm 33 is fastened to the seatbelt fixing pillar 2 by screw fasteners 34. The height position of each shaft supporting arm 33 is adjustable by selecting some of screw holes 35 formed in the seatbelt fixing pillar 2.

Shaft supporting arm 33 is T-shaped to shift the position of shaft portion 32 in the front and rear direction or longitudinal direction of the vehicle with respect to the position of seatbelt fixing pillar 2 when the shaft supporting arm 33 is fixed to the seatbelt fixing pillar 2, and thereby avoid interference between the shaft portion 32 and the driver's or front passenger's seat. Therefore, the shape is not limited, and the shaft support arms 33 may be in any of various other shapes capable of restraining the interference. The shaft supporting arms 33 and the shaft portions 32 may be formed to be capable of increasing and decreasing the length to adjust the length.

Moreover, as shown in FIG. 5 and FIG. 9, a second link mechanism 41 connecting the second ends of vehicle restraining jigs 12 rotatably with the poles 10 includes shaft portions 42 provided at the second ends of vehicle restraining jigs 12, and shaft receiving portions or bearing portions 43 which support the shaft portions 42 rotatably, and attached to the poles 10 through brackets 44, respectively.

Each of the brackets 44 is attached to the corresponding pole 10 with a height adjusting mechanism omitted in the figure. Therefore, the height of second link mechanism 41 is adjustable.

A length adjusting mechanism 45 such as a turnbuckle is provided at the end portion of each of left and right vehicle restraining jigs 12 at the side of shaft receiving member 43. Length adjusting mechanism 45 includes a rotary operation member 46 and bolts 47 and 48 which are connected on the left and right sides of the rotary operation member 46 and which are rotated in the opposite directions by rotating the rotary operation member 46, thereby to adjust the length of the vehicle restraining jig 12 in accordance with the length of the vehicle. In the other respects, the construction is the same as the constructions of the first and second embodiments. Therefore, the same reference numerals are given to identical parts and repetitive explanation is omitted.

Following is explanation on one example of the method of using the vehicle restraint apparatus 11 according to the third embodiment.

First, the shaft supporting arm 33 of first link mechanism 31 at the first end of each vehicle restraining jig 12 is attached, at a desired height, to the seatbelt fixing pillar 2. Then, the length of shaft supporting arm 33 and the length of shaft portion 32 are adjusted according to the need, to prevent interference of the shaft portion 32 of first link mechanism 31 with the driver or front passenger's seat.

Next, the second end of each vehicle restraining jig 12 is attached to the pole 10 through the second link mechanism 41 and bracket 44.

Then, the vehicle is restrained by adjusting the lengths and the width of left and right vehicle restraining jigs 12, 12, the rollers 7 are rotated, and various tests of the vehicle 1 are performed.

The vehicle restraint apparatus 11 according to the third embodiment can enable the length adjustment and width adjustment of vehicle restraining jigs 12 and moreover prevent interference between the shaft portions 32 of first link mechanisms 31 and the driver and front passenger's seats by setting the position of shaft portion 32 of first link mechanism 31 connecting the first end of each of vehicle restraining jigs 12, 12, rotatably to the seatbelt fixing pillar 2, away from the position of seatbelt fixing pillar 2, with the shaft supporting arm 33.

Furthermore, the second link mechanism 41 is attached to the poles 10 in the manner allowing the up and down shift. Therefore, this embodiment can enable the setting for holding each vehicle restraining jig 12 substantially horizontal by moving the second link mechanism 41 in the up and down direction in conformity with the height of first link mechanism 31, and enable the various test in the horizontal state of the vehicle restraining jigs. In the other respects, the construction and effects are the same as those of the vehicle restraint apparatus according to the first and second embodiments, so that repetitive explanation is omitted.

Fourth Embodiment

FIGS. 10 and 11 show a fourth embodiment. In this embodiment, a first link mechanism 51 is provided in place of the first link mechanisms 16 in the mode of the first embodiment.

The first link mechanism 51 includes a length-adjustable reinforcing jig 52 to connect and reinforce a pair of pillar mount members 20 attached, respectively, to the inside surfaces 2 a of left and right seatbelt fixing pillars 2 in vehicle 1, and connecting jigs 53 connecting the vehicle restraining jigs 12, respectively, with portions of the first link mechanism near both ends of the reinforcing jig 52, rotatably in an omnidirectional manner to allow rotation in all rearward directions rearwards on the outer side of vehicle 1.

The reinforcing jig 52 includes a cross member connecting the left and right pillar mount members 20. Reinforcing jig 52 is provided with a length adjusting mechanism 54 to adjust the length of reinforcing jig 52. Reinforcing jig 52 is attached to the two pillar mount members 20 in an adjustable manner capable of adjusting the position of reinforcing jig 52 in the vehicle height direction (to a height substantially equal to the height of the vehicle gravity center 6, for example).

Each connecting jig 53 includes a pillow ball 55 fixedly mounted on reinforcing jig 52 near one end of the reinforcing jig 52, a spherical bearing portion 56 receiving this pillow ball 55, and a joining jig 57 joining this spherical bearing portion 56 to vehicle restraining jig 12.

Following is explanation on one example of the method of using the vehicle restraint apparatus 11 according to this embodiment with reference to FIGS. 10 and 11.

In the case of vehicle 1 having rear seat doors or rear side doors 121, for example, first the vehicle is set in the state in which the doors 121 are removed or in the state in which the doors 121 are held open and fixed by door restraining jigs 58. Alternatively, the vehicle is set in the state in which the driver's door and front passenger's door 120 are removed or in the state in which the doors 120 are held open and fixed by the door restraining jigs 58.

As door restraining jigs 58, it is possible to use various restraining jigs such as device for fixing with sucker(s). However, there is no specific limitation, and it is possible to use known restraining jigs which can fix doors so as to prevent contact between the rear seat doors 121 and vehicle restraining jigs 12. Moreover, there is no limitation to the positions and the number of door restraining jigs 58 as long as the object is achieved to prevent contact between the rear seat doors 121 and vehicle restraining jigs 12.

Next, the first ends of vehicle restraining jigs 12 inserted into vehicle 1 obliquely from the outside on the rear side are connected, respectively, with the connecting jigs 53 of first link mechanism 51 installed in vehicle 1. The vehicle restraining jig 12 connected with each connecting jig 53 is rotatable in all directions on the rear side outside vehicle 1. Next, the second ends of vehicle restraining jigs 12 are connected rotatably with the poles 10 through the second link mechanism 17 at the positions substantially equal in height to the vehicle gravity center 6.

Next, the lengths of vehicle restraining jigs 12 are adjusted with the length adjusting mechanisms 13, and the spacing between vehicle restraining jigs 12 is adjusted with the length adjusting mechanism 15. Moreover, each poles 10 is adjusted at a pedestal or base 100 on the floor to adjust the height of the pole 10, the position in the front and rear direction or longitudinal direction of vehicle 1 or the widthwise direction of vehicle 1, and the connecting direction with respect to the vehicle restraining jig 12 suitably.

After vehicle 1 is restrained in this way, the rollers 7 of the chassis dynamometer are rotated, and various tests are performed for the vehicle 1.

According to the thus-constructed vehicle restraint apparatus 11 according to this embodiment, the first ends of the seat restraining jigs 12 are connected rotatably at the inside surfaces 2 a of seatbelt fixing pillars 2 by the link mechanism 51, and the other ends of vehicle restraining jigs 12 are connected rotatably at the poles 10 by the link mechanisms 17. Therefore, the restraint apparatus according to this embodiment can restrain vehicle 1 securely and firmly like the vehicle restraint apparatus of the first embodiment. Moreover, though the vehicle is restrained in the vehicle (translational) front and rear motion or longitudinal motion, the vehicle (rotational) pitching motion and the vehicle (translational) up and down motion are free. Therefore, the vehicle restraint apparatus according to this embodiment can realize the vehicle behavior with the vertical load approximate to the actual vertical load on a road, and the vertical load applied to a tire can be varied in the same manner as in the traveling state including the accelerating/decelerating state. Thus, the vehicle restraint apparatus according to this embodiment can enable tests including a test for the fuel consumption in the mode operation, an exhaust gas test, a vehicle performance test and a test for vehicle behaviors.

Especially, in this embodiment, each vehicle restraining jig 12 can be connected with the portion near one end of reinforcing jig 52 in vehicle 1, obliquely from the outside of vehicle 1 on the rear side, through connecting jig 53, in the state in which the rear seat door of vehicle 1 is removed or fixed open. Therefore, without receiving influence of the shapes of the rear seats and trunk room etc., it is possible to adjust the connecting position between vehicle 1 and vehicle restraining jig 12, easily near the vehicle gravity center 6. Furthermore, it is possible to minimize the alteration of vehicle 1 required at the time of setting the vehicle 1 in the vehicle test system, and hence reduce the time of preparation for the test.

Furthermore, vehicle restraining jigs 12 are made rotatable in all directions on the rear side outside the vehicle 1, by the connecting jigs 53, at the respective positions near the pillar mount members 20 (near both ends of reinforcing jig 52 in this practical example). Therefore, it is possible to set the vehicle restraining jigs 12 at desired positions at or near the height of vehicle gravity center 6 in accordance with the space in vehicle 1 in which vehicle restraining jigs 12 are inserted. Accordingly, the vehicle restraint apparatus of this embodiment can prevent a pitching movement of vehicle 1 (over swing, for example) which could be caused, differently from the travel on the road, when the vehicle test is performed in the state in which vehicle 1 restrained at the height positions remote from the vehicle gravity center 6 to avoid interference with the rear seats and trunk room of vehicle 1.

Moreover, the pair of confronting pillar mount members 20 are connected and reinforced by the reinforcing jig 52 in vehicle 1. Furthermore, the vehicle restraining jigs 12 are connected through the connecting jigs 53 with the reinforcing jig 52 near both ends of this reinforcing jig 52. Therefore, it is possible to reduce the load factor of moment (torque) of the vehicle restraining jigs 12 to the reinforcing jig 52, and hence it is possible to prevent deformation of the reinforcing jig 52 and deformation and breakage of pillar mount members 20 caused by the deformation of reinforcing jig 52. Furthermore, the length adjusting mechanism 54 can adjust the length of reinforcing jig 52, to a desired length corresponding to the size of vehicle 1. Furthermore, the reinforcing jig 52 is arranged to adjust the positions at the left and right pillar mount members 20 in the vehicle height direction of vehicle 1, so that the reinforcing jig 5 can be adjusted to a height close to the vehicle gravity center 6 in dependence on the size of vehicle.

As evident from the explanation above, the vehicle restraint apparatus 11 according to this embodiment is effective for restraining the vehicle 1 of the four door type, for example.

In the case in which the pillar mount members 20 are rigid enough because of the selection of the material, the reinforcing jig 52 is not always required by the first link mechanisms 51. In this case, the pillow ball 55 of each connecting jig 53 is installed and fixed to a short small fixing shaft provided integrally in the pillar mount member 20, for example.

Fifth Embodiment

FIG. 12 shows a fifth embodiment. In this embodiment, the restraining force sensor(s) 29 is provided between the vehicle restraining jigs 12 and second link mechanism 17 in the mode of the fourth embodiment, and arranged to sense the restraining force of the vehicle. The position of restraining force sensor 29 is not limited to the region between the vehicle restraining jig 12 and second link mechanism 17. Restraining force sensor(s) 29 may be provided at a position between second link mechanism 17 and poles 10, a position between first link mechanism 16 and seatbelt fixing pillar 2, or some other position capable of securely sensing the restraining force of restraining vehicle 1. The vehicle restraint apparatus 11 of this embodiment capable of sensing the vehicle restraining force makes it possible to measure and analyze the vehicle sprung characteristics, in addition to the effects of the fourth embodiment.

Sixth Embodiment

FIGS. 13(a) and 13(b) show a sixth embodiment. In this embodiment, the first end of vehicle restraining jig 12 is connected rotatably to each of the left and right seatbelt fixing pillars 2 through the first link mechanism 51 at a position in the vicinity of the vehicle gravity center 6, obliquely from the rear side in the inside of vehicle 1, and the other respects are the same as the fourth embodiment.

Following is explanation on one example of the use of the vehicle restraint apparatus 11 of this embodiment with reference to FIG. 13.

In the case of vehicle 1 to be tested being a vehicle having a rear door, such as a hatchback type vehicle, for example, the rear door is opened and fixed by a door restraining jig 58 omitted in the figure. Next, to the connecting jigs 53 of first link mechanism 51 installed in vehicle 1, the first ends of vehicle restraining jigs 12 inserted into vehicle 1, obliquely from the rear inside the vehicle 1 are connected. The vehicle restraining jigs 12 connected with the connecting jigs 53 are rotatable in all directions rearwards inside the vehicle 1. Next, as in the fourth embodiment, the second ends of vehicle restraining jigs 12 are connected rotatably, through second link mechanisms 17, with poles 10 at positions substantially equal in height to the vehicle gravity center 6. Moreover, the lengths and spacing of vehicle restraining jigs 12 are adjusted, respectively, with length adjusting mechanisms 13 and 15. Poles 10 are adjusted too to adjust the heights and the positions in the front and rear direction or the left and right direction and the connecting directions of vehicle restraining jigs 12. After vehicle 1 is retrained as mentioned above, various tests for vehicle 1 are performed by rotating rollers 7 of the chassis dynamometer.

According to the thus-constructed vehicle restraint apparatus 11 according to this embodiment, the first ends of seat restraining jigs 12 are connected rotatably at the inside surfaces 2 a of seatbelt fixing pillars 2 by the link mechanism 51, and the other ends of vehicle restraining jigs 12 are connected rotatably at the poles 10 by link mechanisms 17. Therefore, the restraint apparatus according to this embodiment can restrain vehicle 1 securely and firmly like the vehicle restraint apparatus of the fourth embodiment. Moreover, though the vehicle is restrained in the vehicle (translational) longitudinal motion, the vehicle (rotational) pitching motion and the vehicle (translational) up and down motion are free. Therefore, the vehicle restraint apparatus according to this embodiment can realize the vehicle behavior with the vertical load approximate to the actual vertical load on a road.

Especially, in this embodiment, each vehicle restraining jig 12 can be connected near one end of reinforcing jig 52 in vehicle 1, obliquely from the rear side in the inside of vehicle 1. Therefore, it is possible to adjust the connecting position between vehicle 1 and vehicle restraining jig 12, easily near the vehicle gravity center 6 in a state reducing physical interference with the rear tire house and the opening of the rear door. Furthermore, it is possible to minimize the alteration of vehicle 1 required at the time of setting the vehicle 1 in the vehicle test system, and hence reduce the time of preparation for the test.

Furthermore, vehicle restraining jigs 12 are made rotatable in all directions on the rear side of the inside of vehicle 1, by the connecting jigs 53, at the portions of the first link mechanism near the pillar mount members 20 (near both ends of reinforcing jig 52 in this practical example). Therefore, it is possible to set the vehicle restraining jigs 12 at desired positions at or near the height of vehicle gravity center 6 in accordance with the space in vehicle 1 in which vehicle restraining jigs 12 are inserted. Accordingly, the vehicle restraint apparatus of this embodiment can prevent a pitching movement of vehicle 1 (over swing, for example) which could be caused, differently from the travel on the road, when the vehicle test is performed in the state in which vehicle 1 restrained at the height positions set remote from the vehicle gravity center 6 to avoid interference with the rear tire house and the opening of rear door of vehicle 1.

Moreover, the pair of pillar mount members 20 confronting each other in the vehicle are connected by the reinforcing jig 52. Furthermore, the vehicle restraining jigs 12 are connected through the connecting jigs 53 with the portions near both ends of this reinforcing jig 52. Therefore, the pillar mount members 20 are reinforced as in the fourth embodiment. Moreover, because the load factor of moment (torque) of the vehicle restraining jigs 12 to the reinforcing jig 52 is reduced, it is possible to prevent deformation of the reinforcing jig 52 and deformation and breakage of pillar mount members 20 caused by the deformation of reinforcing jig 52. Furthermore, the length adjusting mechanism 54 can adjust the length of reinforcing jig 52, to a desired length corresponding to the size of vehicle 1.

As evident from the explanation above, the vehicle restraint apparatus 11 according to this embodiment is effective for restraining the vehicle 1 of the two door type and the rear door type having a rear door, for example.

In the case in which the pillar mount members 20 are rigid enough because of the selection of the material, the reinforcing jig 52 is not always required by the first link mechanisms 51. In this case, the pillow ball 55 of each connecting jig 53 is installed and fixed to a short small fixing shaft provided integrally in the pillar mount member 20, for example, as mentioned before.

Seventh Embodiment

FIGS. 14(a) and 14(b) show a seventh embodiment. In this embodiment, the restraining force sensor or sensors 29 is provided between the first link mechanism 17 and pole 10 in the mode of the sixth embodiment, and arranged to sense the restraining force of the vehicle. The position of restraining force sensor 29 is not limited to the region between the second link mechanism 17 and pole 10. Restraining force sensor(s) 29 may be provided at a position between vehicle restraining jig 12 and the second link mechanism 17, a position between first link mechanism 16 and seatbelt fixing pillar 2, or some other position capable of sensing the restraining force of restraining vehicle 1 securely. The vehicle restraint apparatus 11 of this embodiment capable of sensing the vehicle restraining force makes it possible to measure and analyze the vehicle sprung characteristics, in addition to the effects of the sixth embodiment.

Eighth Embodiment

In a vehicle restraint apparatus of an eighth embodiment shown in FIGS. 15 and 16, there is provided a first link mechanism 71 in place of the first link mechanism 51 in the mode of the fourth embodiment.

The first link mechanism 71 includes a pair of pillar mount members 72 a attached or fixed, respectively, to the outside surfaces 2 b of left and right seatbelt fixing pillars 2, connecting shafts 73 attached or fixed, respectively, to the outside surfaces of pillar mount members 75, connecting jigs 53 mounted on the connecting shafts 73 and arranged to connect the vehicle restraining jigs 12 rotatably in all directions rearwards in the outside of vehicle 1, and pressing members 74 pressing and fixing the connecting shafts 73 to the pillar mount member 72 a, respectively.

Each pillar mount member 72 a is formed with screw holes 24 a receiving screw fasteners 25 screwed therein, for fastening this member 72 a to the outside surface 2 b of seatbelt fixing pillar 2, and screw holes 24 b receiving screw fasteners 25 screwed therein, for fastening the pressing member to this member 72 a. In each pillar mount member 72 a, the connecting shaft 73 is arranged to be able to adjust the position of the connecting shaft 73 in the vehicle height direction.

Following is explanation on an example of the use of vehicle restraint apparatus according to this embodiment with reference to FIGS. 15 and 16.

First, the rear seat doors and door hinges are removed from attachment portions 70 in the outside surfaces 2 b of left and right seatbelt fixing pillars 2 of vehicle 1, supporting the rear seat doors and the door hinges.

On the other hand, the connecting shaft 73 with the connecting jig 53 mounted on the connecting shaft is attached preliminarily to the outside surface of each pillar mount member 72 a so that the connecting shaft 73 projects from the outside surface of pillar mount member 72 a, and the pressing member 74 is fastened to this member 72 a by screw fasteners 25 in the state pressing the connecting shaft 73.

Next, in the state in which each screw hole 24 a of pillar mount member 72 a is superposed on the mating screw hole 23 formed in the attachment portion 70 in the outside surface 2 b of each seat belt fixing pillar 2, the screw fastener 25 is screwed into these screw holes 23 and 24 a. Through the pillar mount members 72 a fixed to the outside surface 2 b of seatbelt fixing pillars 2 in this way, the first link mechanism 71 is attached to the outside surfaces 2 b of seatbelt fixing pillars 2. The connecting jigs 53 of first link mechanism 71 attached to the outside surfaces 2 b of seatbelt fixing pillars 2, at the positions near the vehicle brevity center 6 are connected with the first ends of vehicle restraining jigs 12 inserted obliquely from the rear side in the outside of vehicle 1 in vehicle 1. The vehicle restraining jigs 12 connected with connecting jigs 53 are rotatable in the omnidirectional manner in all directions rearwards in the outside of vehicle 1 by the pillow balls 55 (FIG. 10) of connecting jigs 53.

Next, as in the fourth embodiment, the lengths of vehicle restraining jigs 12 are adjusted with length adjusting mechanisms 13. Furthermore, the second ends of vehicle restraining jigs 12 are connected rotatably with poles 10 through second link mechanism 17 at the positions substantially equal in height to the height position of vehicle gravity center 6. Then, poles 10 are adjusted at the pedestals 100 of the poles to adjust the heights of the poles, the positions of the poles in the front and rear direction or widthwise direction of vehicle 1 and the connecting directions with vehicle restraining jigs 12 appropriately.

After vehicle 1 is thus restrained, various tests are performed for vehicle 1 by rotating the rotors 7 of chassis dynamometer.

As mentioned above, the vehicle restraint apparatus 11 of this embodiment connects the first ends of vehicle restraining jigs 12 rotatably with the seatbelt fixing pillars 2 at the outside surfaces 2 b with first link mechanisms 71, and connects the second ends of vehicle restraining jigs 12 rotatably at poles 10 with second link mechanisms 17.

Therefore, the vehicle restraint apparatus 11 of this embodiment provides the same effects as the vehicle restraint apparatus according to the fourth embodiment. Specifically, the restraint apparatus according to this embodiment can restrain vehicle 1 securely and firmly. Moreover, though the vehicle is restrained in the vehicle (translational) front and rear motion, the vehicle (rotational) pitching motion and the vehicle (translational) up and down motion are free. Therefore, the vehicle restraint apparatus according to this embodiment can realize the vehicle behavior with the vertical load approximate to the actual vertical load on a road.

Especially in the case of test vehicle 1 having rear side doors or rear seat doors 121, the vehicle can be restrained by removing the rear side doors 121, attaching the first link mechanism 71 to the outside surfaces 21 b of left and right seatbelt fixing pillars 2 of vehicle 1, and connecting the first ends of vehicle restraining jigs 12 with the first link mechanism 71. According to this mode, at the time of vehicle test, the driver's seat and front passenger's seat are adjustable toward the rear, and the distance between the driver's seat and the steering wheel is adjustable to a desired distance. Therefore, this vehicle restraint apparatus can secure the distance between the steering wheel and the driver's seat required by the physique of a driver or the installation of measurement equipment, and avoid adverse influence on the test operation of vehicle 1.

Moreover, the connecting shafts 73 are adjustable in the vehicle height direction at the pillar mount members 72 a. Therefore, it is possible to adjust the positions of connecting shafts 73 to desired positions in the vicinity of the vehicle gravity center 6 in dependence on the size of vehicle 1.

In this embodiment, the pillar mount members 72 a may be replaced by pillar mount members 72 b as shown in FIGS. 17 and 18.

The pillar mount members 72 b are wider than pillar mount members 72 a. As shown in FIG. 17(B), the pillar mount member 72 b on each side is attached to the outside surface 2 b of seatbelt fixing pillar 2 in the state in which one of longer sides projects from the seatbelt fixing pillar 2 rearwards (in the wheel base direction).

The connecting jig 53 on each side for connecting the vehicle restraining jig 12 rotatably in the omnidirectional manner rearwards outside vehicle 1 is preliminarily mounted on the connecting shaft 73 fixed upright to the outside surface of pillar mount member 72 b by the pressing member 74 at a position near the seatbelt fixing pillar 2 on the rear side of the seatbelt fixing pillar 2. The connecting shafts 73 are adjustable in the vehicle height direction in this practical example, too.

The left and right pillar mount members 72 b confronting each other in vehicle 1 through left and right seatbelt fixing pillars 2 are connected and reinforced by the reinforcing jig 52 which is disposed coaxially with the connecting shafts 73 and which is adjustable in length. The position of reinforcing jig 52 in this mode is also adjustable in the vehicle height direction. The reinforcing jig 52 may be connected with connecting shafts 73.

In this way, in the practical example of FIGS. 17 and 18, the width of each pillar mount member 72 b is increased in the vehicle wheel base direction (offset in the wheel base direction). The vehicle restraining jig 12 is attached to the portion of outside surface of this pillar mount member 72 b near, and on the rear side of, the seatbelt fixing pillar 2, rotationally in the rearward omnidirectional manner on the outside.

Therefore, in the practical example of FIGS. 17 and 18, at the time of vehicle test, the driver's seat and front passenger's seat are adjustable toward the rear, and the distance between the driver's seat and the steering wheel is adjustable to a desired distance, as in the practical example of FIGS. 15 and 16.

Especially, the length-adjustable reinforcing jig 52 connecting and reinforcing the left and right pillar mount members 72 b confronting each other through vehicle 1 can increase the rigidity of pillar mount members 72 b. Moreover, since the reinforcing jig 52 and connecting shafts 73 are adjustable in the vehicle height direction at the pillar mount members 72 b, the reinforcing jig 53 and connecting shafts 73 can be set at desired heights in the vicinity of vehicle gravity center 6 in dependence on the size of vehicle 1.

Furthermore, in this embodiment, the connecting shaft 73 connected rotatably with the connecting jig 53 on each side may be formed so that the connecting shaft 73 projects from the inside surface of the pillar mount member 72 b, as shown in FIGS. 19 and 20. The connecting shafts 73 of this practical example are also adjustable in the vehicle height direction.

The connecting shaft 73 on each side is fixed to the inside surface of the pillar mount member 72 b and projects from the inside surface of pillar mount member 72 b at the position near the seatbelt fixing pillar 2 on the rear side of seatbelt fixing pillar 2. Moreover, the connecting shafts 73 are connected with the reinforcing jig 52 connecting and reinforcing the left and right pillar mount members 72 b confronting each other in the vehicle 1.

This practical example can provide the same effects as the practical example of FIGS. 17 and 18. Especially, this practical example does not require the pressing members 74 for pressing the connecting shafts 73. Therefore, it is possible to reduce the number of component parts of the link mechanism 71 and to simplify the operation of assembling the vehicle restraint apparatus 11 with vehicle 1.

Furthermore, in this embodiment, as shown in FIGS. 21 and 22, there may be provided, between the connecting shaft 73 on each side and the reinforcing jig 52, a pillar mount member 72 c. The pillar mount member 72 c is wider and longer than the pillar mount member 72 b.

The pillar mount member 72 c is attached to the inside surface 2 a of each of the left and right seatbelt fixing pillars 2 by screw fasteners 25 in the state in which the connecting shaft 73 provided with the connecting jig 53 is clamped between the pillar mount member 72 c and the pillar mount member 72 b. The left and right pillar mount members 72 c thus fixed to the inside surfaces 2 a of left and right seatbelt fixing pillars 2 are connected and reinforced by the length adjustable reinforcing jig 52 disposed coaxially with the connecting shafts 73. This reinforcing jig 52 may be connected with the connecting shafts 73. The reinforcing jig 52 and the connecting shafts 73 are adjustable in the vehicle height direction.

This practical example too can provide the same effects as the practical example of FIGS. 17 and 18, evidently. Especially, in this practical example, as shown in FIGS. 21 and 22, the connecting shaft 73 equipped with the connecting jig 53 on each side is clamped between the outside pillar mount member 72 b fixed to the outside surface 2 b of seatbelt fixing pillar 2 and the inside pillar mount member 72 c fixed to the inside surface 2 a of seatbelt fixing pillar 2, and the inside pillar mount members 762 c confronting each other inside the vehicle are connected and reinforced by the length adjustable reinforcing jig 52. This structure improves the rigidity of the link mechanism 71 connecting the vehicle restraining jigs 12 with vehicle 1.

Ninth Embodiment

FIGS. 23˜26 show a ninth embodiment. In this embodiment, the pair of vehicle restraining jigs 12 are replaced by a pair of vehicle restraining jigs 82 shorter than the vehicle restraining jigs 12, and the poles 10 are replaced by vehicle outside anchor devices or vehicle outside fixing devices 83 in the modes of the fourth to seventh embodiments.

As shown in FIGS. 23 and 24, the first ends of left and right vehicle restraining jigs 82 are connected with the link mechanism 51 at pillar mount members 20 attached to the inside surfaces 2 a of left and right seatbelt fixing pillars 2 of vehicle 1 having rear seat doors 121, and the second ends of vehicle restraining jigs 82 are connected with a link mechanism 84 disposed in a rear seat interior space 122 of vehicle 1.

The reinforcing jig 52 of link mechanism 51 is adjustable to adjust the position of reinforcing jig 52 at the pillar mount members 20, in the vehicle height direction. The explanation on the constructions and functions of link mechanism 51 and the connecting jigs 53 included in link mechanism 51 are omitted because the constructions and functions of link mechanism 51 and the connecting jigs 53 are explained before in the forth embodiment with reference to FIG. 10.

The vehicle outside anchor devices 83 are disposed, in a pair, on the floor 9, near the left and right rear seat doors 121 of vehicle 1, respectively, and arranged to support the link mechanism 84 through the openings 123 of rear seat doors 121.

As shown in FIG. 25, the link mechanism 84 includes left and right attaching members 85, a first reinforcing jig 86 and a pair of connecting jigs 53. The left and right attaching members 85 extend vertically and confront each other in the rear seat interior space 122 of vehicle 1 at the side of rear seat doors 121. The left and right attaching members 85 are supported by the vehicle outside anchor devices 83. The first reinforcing jig 86 connects and reinforces the left and right attaching members 85. The first reinforcing jig 86 is adjustable so that the length of first reinforcing jig 86 is adjustable. The connecting jigs 53 connect the second ends of vehicle restraining jigs 82 rotatably with portions near both ends of first restraining jig 86.

The first reinforcing jig 86 is attached to the left and right attaching members 85 confronting each other inside the vehicle 1, in the adjustable manner enabling the adjustment of the position of first reinforcing jig 86 in the vehicle height direction. Near one end of first reinforcing jig 86, a pillow ball 55 (FIG. 10) of connecting jig 53 is preliminarily attached and fixed. The left and right attaching members 85 confronting each other are further reinforced secondarily by second reinforcing jig(s) 87 provided therebetween.

The vehicle outside anchor devices 83 include left and right support members 831 supporting the left and right attaching members of link mechanism 84 upright in vehicle 1, respectively. The two support members 831 are supported horizontally by horizontal supporting members 832 included in the main bodies of vehicle outside anchor devices 83, respectively, and connected by a connecting reinforce member 833 connecting and reinforcing the left and right support members 831 stably. Like the poles 10 in the first to eighth embodiments, the vehicle outside anchor devices 83 are installed on the floor 9 in the adjustable manner capable of adjusting the positions in either of the vehicle width direction, vehicle length direction and vehicle height direction.

The vehicle restraint apparatus 11 according to this embodiment is used in the following manner, for example, as shown in FIGS. 23˜25.

First, the pillar mount members 20 of the first link mechanism 51 including the connecting jigs 53 connected with the first ends of vehicle restraining jigs 82 are attached to the inside surfaces 2 a of seatbelt fixing pillars 2, respectively. Accordingly, the vehicle restraining jigs 82 are connected rotatably in the omnidirectional manner rearwards in vehicle 1, in the vicinity of the vehicle gravity center 6. Next, the second ends of vehicle restraining jigs 872 are connected with the connecting jigs 53 of link mechanism 84 supported in the rear seat interior space 122, at the height substantially equal to the height of vehicle gravity center 6. Then, the lengths of vehicle restraining jigs 82 are adjusted with length adjusting mechanisms 13, and the positions of vehicle outside anchor devices 83 are adjusted in the vehicle width direction, the vehicle length direction and/or the vehicle height direction. After vehicle 1 is thus restrained, the rollers 7 of chassis dynamometer are rotated and various tests of vehicle 1 are performed.

Therefore, the vehicle restraint apparatus 11 of this embodiment can restrain vehicle 1 securely and firmly like the vehicle restraint apparatus 11 of the sixth embodiment. Moreover, though the vehicle is restrained in the vehicle (translational) longitudinal motion, the vehicle (rotational) pitching motion and the vehicle (translational) up and down motion are set free. Therefore, the vehicle restraint apparatus according to this embodiment can realize the vehicle behavior with the vertical load approximate to the actual vertical load on a road.

Especially, this embodiment provides following effects in addition to the effects of the sixth embodiment. In the case of the test vehicle being of the type having rear seat doors 121, the link mechanism 84 connected with the second ends of vehicle restraining jigs 82 is supported by the vehicle outside anchor or fixing devices 83 through the openings 123 for the rear seat doors 121, so that it is possible to reduce the alteration of vehicle 1 to be tested.

Moreover, the reinforcing jig 52 and the first reinforcing jig 86 are attached to the members 20 and 85 for attachment, respectively, in the adjustable manner allowing the position adjustment in the vehicle height direction of vehicle 1. Therefore, it is possible to set the reinforcing jig 52 and first reinforcing jig 86 at desired positions at or near the level of the center of gravity 6 of vehicle 1 in accordance with the size of vehicle 1.

The second ends of vehicle restraining jigs 82 are connected with the portions of first reinforcing jig 86 at or near both ends of first reinforcing jig 86 through the connecting jigs 53. This structure can reduce the load factor of the moment (torque) of vehicle restraining jigs 82 to the first reinforcing jig 86, and thereby prevent deformation of first reinforcing jig 86 and related deformation and breakage of pillar attaching members 85.

The length-adjustable second reinforcing jig 87 further reinforcing the left and right attaching members 85 auxiliary can reinforce the pillar attaching members 85 and simultaneously support the first reinforcing jig 86 more stably.

Furthermore, as shown in FIG. 26, the vehicle restraining jig(s) 82 may be provided with the restraining force sensor 29, as in the fifth embodiment. In this practical example, the apparatus can sense the restraining force of the vehicle, and hence obtain the measurement signal of the restraining force of vehicle 1 in the longitudinal direction or front and rear direction.

Furthermore, as shown in FIG. 26, the vehicle restraining jig(s) 82 may be provided with a vibration damping device 89 to attenuate characteristic vibration of jig(s) 82. As the vibration damping device 89, it is possible to employ a known vibration damping device attached to vehicle restraining jig 12, 82 in a non-concentric manner or a non-coaxial manner.

The vibration damping device 89 includes an attachment member 89 a attached to the vehicle restraining jig 82 detachably, an elastic member 89 b, such as rubber, spring, connected detachably with the member 89 a, and a weight or plumb 89 c connected detachably with the member 89 b.

In the practical example of FIG. 26, the vibration damping device 89 attenuates vibration of the vehicle restraining jig 82 produced at the time of test of vehicle 1. Therefore, the restraining sensor 29 can sense the restraining force with reduced influence of the vehicle restraining jig 82.

Tenth Embodiment

FIGS. 27 and 28 show a tenth embodiment. The vehicle restraint apparatus of this embodiment includes a deflection absorbing mechanism(s) 90 to absorb deflection or bending of the vehicle restraining jig(s) 12 or 82 produced at the time of test of the vehicle 1 with the chassis dynamometer in any one of the first to ninth embodiments.

The deflection absorbing mechanism 90 shown in FIG. 27 includes a jig receiving section 901 including a buffer or cushioning material 900 abutting elastically on the vehicle restraining jig deflected in the direction of gravity at the time of the tests, and a prop or column section 902 supporting the jig receiving section 901 rotatably in the horizontal direction or the vertical direction. As the buffer 900, it is possible to use a thick plate of known elastic material such as polyethylene.

The prop section 902 stands upright on a base section 903 placed on the floor 9 in the adjustable manner allowing the adjustment of the position in any of the vehicle width direction, vehicle length direction and vehicle height direction of vehicle 1.

This embodiment can absorb shock of the vehicle restraining jig(s) 12 or 82 deflecting in the direction of gravity at the time of testing of vehicle 1 with the chassis dynamometer, with the buffer(s) 900 of the deflection absorbing mechanism 90, in addition to the effects of the first to ninth embodiments.

Even if the vehicle restraining jigs 12 or 82 are deflected due to hard deceleration of vehicle 1 in a brake operation test, for example, the buffers 9 of the jig receiving sections 901 can absorb the deflection, and thereby the deflection absorbing mechanism can reduce influence on a measurement signal of the restraining force of the restraining force sensor 29. Furthermore, the deflection absorbing mechanism can prevent damage caused by buckling of the vehicle restraining jigs 12 or 82.

Especially, the jig receiving sections 901 are disposed below the vehicle restraining jigs 12 or 82 (in the direction of gravity) and arranged to rotate in the horizontal direction or the vertical direction. Therefore, the jig receiving sections can absorb deflection of the vehicle restraining jigs 12 or 82 from any direction.

As shown in FIG. 28, the jig receiving section 901 may be provided with a pair of stopper portions 904 each having a buffer 900 abutting elastically against the vehicle restraining jig deflected in the horizontal direction. In this practical example, impact of the vehicle restraining jig 12 or 82 deflecting in the direction of gravity and the vehicle width direction can be absorbed securely by the buffers 900 of stopper portions 904. Therefore, the deflection absorbing mechanism makes it possible to obtain the measurement signal of the restraining force sensor 29 under further reduced influence of the vehicle restraining jig 12 or 82. Furthermore, the deflection absorbing mechanism can prevent damage caused by buckling of the vehicle restraining jigs 12 or 82.

As shown in FIG. 29, in this embodiment too, the vibration damping device(s) 89 may be attached detachably to the vehicle restraining jig(s) 12 or 82 as in the ninth embodiment. In the practical example, the vibration damping device 89 attenuates vibration of the vehicle restraining jig 82 produced at the time of test of vehicle 1. Therefore, the restraining sensor 29 can sense the restraining force with further reduced influence of the vehicle restraining jig 82.

Eleventh Embodiment

FIG. 30 shows an eleventh embodiment. The vehicle restraint apparatus 11 according to this embodiment includes vibration damping device(s) 89 to damp characteristic vibration of the vehicle restraining jig(s) 12 or 82 produced at the time of test of the vehicle 1 with the chassis dynamometer in any one of the first to tenth embodiments.

As the vibration damping device 89, it is possible to employ a vibration damping device attached detachably to the vehicle restraining jig 12 or 82 in a non-concentric manner or a non-coaxial manner, as shown in FIG. 30.

The vibration damping device 89 shown in FIG. 30(A) includes an attachment member or attaching member 891 attached to the vehicle restraining jig 12, 82 detachably, an elastic member 892 connected detachably with an outer side surface of a lower end portion 891 c of the attachment member 891, a shank portion or shaft portion 893 which includes a first end connected detachably with the elastic member 892 and which is adjustable in length, and a weight portion 894 which is connected detachably with a second end of the shank portion 893 and which is adjustable in weight.

The attachment member 891 includes an upper end portion 891 a attached detachably to the vehicle restraining jig 12, 82, a main portion 891 b attached detachably to the upper end portion 891 a, and the lower end portion 891 c attached detachably to the main portion 891 b.

The main portion 891 b is rotatable, in an omnidirectional manner, about the upper end portion 891 a (about the position at which the upper end portion 891 a is attached to the vehicle restraining jig 12, 82), in an omnidirectional manner for all directions. To enable the omnidirectional rotation, the upper end portion 891 is provided with a pillow ball, for example, at the upper end.

The main portion 891 b is detachable from upper end portion 891 a, so that it is possible to select an appropriate one of main portions 891 b having different lengths. The change of main portion 891 b is not required when the main portion 891 b is provided with a length adjusting mechanism.

The lower end portion 891 c is rotatable in the horizontal direction. For example, the lower end portion 891 c is formed with an internally threaded portion into which the lower end of main portion 891 b is screwed, so that the lower end portion 891 c is rotatable in the horizontal direction.

As the elastic member 892, it is possible to use an elastic or resilient member such as elastic rubber or coil spring used in a well-known anti-vibration damper. As the shank portion 893, it is possible to employ a length adjustable screw shaft screwed into the elastic member 892, for example. As the weight portion 894, it is possible to use a dividable weight of a known shape, attached to the shank portion 893 by means of thread engagement, for example.

In this embodiment, the vibration damping device 89 can attenuate characteristic vibration of each vehicle restraining jig 12, 82 produced at the time of test of vehicle 1, in addition to the effects of the first to tenth embodiments. Therefore, the restraining force sensor 29 can sense the restraining force with reduced influence of the vehicle restraining jigs.

For example, even in the case of hard acceleration/deceleration of vehicle 1 under test, the vibration damping devices 89 reduce the damping rate of characteristic or natural vibration of the vehicle restraining jigs 12, 86, and reduce the time of amplitude, so that the apparatus can restrain influence on the measurement signal of restraining force sensors 29.

Patent documents 4˜7 disclose conventional vibration damping devices to attenuate natural vibration of a rod-shaped member. These vibration damping devices are designed to attenuate natural vibration of a rod-shaped member having one end set free, and arranged to be attached to the rod-shaped member concentrically or coaxially. Therefore, in the case of a rod-like member, such as vehicle restraining jigs 12, 82, having both ends fixed, these vibration damping devices are inadequate for suppressing natural vibration of the rod-like member since the change of weights for adjusting the damping rate is difficult.

By contrast, each vibration damping device 89 is so arranged that vibration damping device 89 can be attached non-concentrically or non-coaxially at a position away from the vehicle restraining jig 12, 82 in a detachable manner allowing operations of attaching and removing the device to and from the vehicle restraining jig. Therefore, it is easy to attach the vibration damping device 89 to the rod-like member having both ends fixed, so that the adjustment of natural frequency is difficult. Moreover, the adjustment of weight of the weight portion 894 is possible even after the installment, and hence the adjustment of the natural vibration frequency and the damping rate of vehicle restraining jig 12, 82 is easy.

Especially, in the vibration damping device 89, the upper end portion 891 a of attachment member 891 is detachable with respect to the vehicle restraining jig 12, 82; the main portion 891 b is detachable with respect to upper end portion 891 a; the lower end portion 891 c is detachable with respect to main portion 891 b, the elastic member 894 is detachable with respect to lower end portion 891 c; the shank portion 893 is detachable with respect to elastic member 892; and the weight portion 894 is detachable with respect to shank portion 893. Therefore, it is possible arbitrarily and individually to set the attachment position of upper end portion 891 a to vehicle restraining jig 12, 82, the lengths of main portion 891 b, shaft portion 893 and elastic member 892, the elastic force of elastic member 892 and the weight of weight portion 894. Consequently, the vibration damping device 89 enables the flexible adjustment to the natural vibration frequency of vehicle restraining jig 12, 82. The above-mentioned effect of the adjustment is further increased by th lower end portion 891 c arranged to be rotatable in the horizontal direction.

It is possible to employ a structure shown in FIG. 30(B). In this structure, a further elastic member 892 is additionally connected detachably to the lower end portion 891 a of attachment member 891 at an outer side surface so that the further elastic member 892 confronts the existing elastic member 892. Moreover, in this structure, a length adjustable shank portion 893 is connected detachably with this elastic member 892, and a weight adjustable weight portion 894 is detachably connected with this shank portion 893. This practical example expands the range of adjustment of the natural vibration frequency and damping rate of vehicle restraining jigs 12, 82.

The vibration damping devices 89 are arranged to damp vibration of vehicle restraining jigs 12, 18 in the examples explained above. However, the object to be damped is not limited to the vehicle restraining jigs 12, 82. The vibration damping device according to the present invention is applicable also to rod-like members undergoing vibrations, to attenuate the natural vibration of the rod-like members.

Twelfth Embodiment

FIGS. 31 and 32 show a twelfth embodiment. The vehicle restraint apparatus 11 according to this embodiment further includes a lateral vibration suppressing mechanism 61 to suppress lateral vibration of the vehicle 1 produced at the time of test of the vehicle 1 with the chassis dynamometer, in any one of the first to eleventh embodiments.

Two of the lateral vibration suppressing mechanisms 61 are disposed on the left and right sides, at the positions of the front wheels of vehicle 1, and two of the lateral vibration suppressing mechanisms 61 are disposed on the left and right sides at the positions of the rear wheels of vehicle 1. Especially, in the case of the fourth and fifth embodiments, these lateral vibration suppressing mechanisms 61 are disposed so as to avoid interference with the vehicle restraining jigs 12.

Each of the lateral vibration suppressing mechanisms 61 includes a buffer member or cushioning member 62 abutting elastically on the main body of vehicle 1, a support member 63 supporting the buffer 62 in an adjustable manner to adjust the position of buffer 62 in the width direction of vehicle 1, and a pillar portion 64 to which the support member 63 is attached.

The buffer member 62 is filled with sponge or air balls. The support member and pillar portion 64 are made of material having tensile strength and compression strength required to suppress the side force of vehicle 1, such as steel or other material superior in the mechanical strength in the form of sheet or pipe like the vehicle restraining jigs 12.

The support member 63 is supported in a horizontal state, by a brace member or horizontal support member 65 fixed to the pillar portion 64, as shown in FIG. 32. The pillar portion 64 is supported upright on a base 67 placed fixedly on the floor 9, by an upright support member 66 in the adjustable manner to enable the position adjustment in any of the vehicle width direction, vehicle length direction and vehicle height direction of vehicle 1.

With the lateral vibration suppressing mechanisms 61, the vehicle restraint apparatus 11 according to this embodiment can suppress lateral vibration (side force) of vehicle 1 produced at the timer of test of vehicle 1 with the chassis dynamometer, in addition to the effects of the first to eleventh embodiments. By so doing, this vehicle restraint apparatus can suppress motion of vehicle 1 other than the pitching motion and up and down motion.

As the vehicle restraint apparatus in the chassis dynamometer, besides the vehicle restraint apparatus disclosed in Patent Documents 1˜3, Patent Documents 8 and 9 show vehicle fixing apparatus. The vehicle fixing apparatus of Patent Document 8 includes fixing units fixing a test vehicle at positions corresponding to the four corners of the test vehicle. The vehicle fixing apparatus of Patent Document 9 includes front and rear stopper bars fixing the front and rear ends of a test vehicle and side pressing portions fixing the left and right sides of the vehicle.

However, the vehicle fixing apparatus of Patent Documents 8 and 9 are arranged to fix the test vehicle on the front and rear sides and left and right side almost completely, so that the vehicle pitching motion tends to be restrained too much beyond the requirement. Therefore, these vehicle fixing apparatus are unable to reproduce the vehicle behavior simulating the behavior on the road as intended, in some cases, like the apparatus of Patent Documents 1˜3.

By contrast, the vehicle restraint apparatus 11 according to this embodiment including the vehicle restraining jigs in one of the first to eleventh embodiments, and the lateral vibration suppressing mechanisms 61 can suppress the side or lateral forces of vehicle 1 produced at the time of test of vehicle 1 while setting the vehicle pitching motion free, and thereby achieve the vehicle behavior including the vertical load simulating the actual behavior on the road more effectively.

Furthermore, the arrangement including the four lateral vibration suppressing mechanisms 61 disposed in a pair at the left and right front wheel positions and in a pair at the left and right rear wheel positions can suppress the lateral vibration of vehicle 1 at the portions around the left and right front fenders and the left and right rear fenders of vehicle 1. Therefore, the operation is feasible without interference with a discharge port of a cooling fan for cooling an engine of vehicle 1, generally disposed at a front part of vehicle 1. Moreover, without interference with the opening/closing operations of the doors of vehicle, it is possible to reduce the time for preparation by setting measuring devices in vehicle 1.

Furthermore, the buffer members 62 of the lateral vibration suppressing mechanisms 61 abut elastically or resiliently on the body of vehicle 1, and thereby reduce influence impeding the vehicle pitching motion. Moreover, because the positions of the buffer members 62 are adjustable by the support members 63 in the width direction of vehicle 1, it is possible to set the positions of buffer members 62 desirably in dependence on the width of vehicle 1.

The pillar portions 64 are adjustable in any of the vehicle width direction, vehicle length direction and vehicle height direction. Therefore, it is it is possible to set the positions of buffer members 62 desirably in dependence on the vehicle width, vehicle length and vehicle height of vehicle 1. 

1. A vehicle restraint apparatus for restraining a vehicle on one or more rollers of a vehicle test system, the vehicle restraint apparatus comprising: a pair of vehicle restraining jigs having first ends joined with left and right seatbelt fixing pillars of the vehicle and second ends joined with left and right poles on a floor.
 2. The vehicle restraint apparatus as recited in claim 1, wherein the first ends of the vehicle restraining jigs are joined rotatably with the seatbelt fixing pillars, respectively, in a vicinity of a center of gravity of the vehicle through a first link mechanism, and the second ends of the vehicle restraining jigs are joined rotatably with the poles, respectively, at positions substantially equal in height to the center of gravity of the vehicle, through a second link mechanism.
 3. The vehicle restraint apparatus as recited in claim 2, wherein the first link mechanism comprises: a pair of pillar mount members attached to the left and right seatbelt fixing pillars, respectively; and connecting jigs connecting the vehicle restraining jigs rotatably in an omnidirectional manner rearwards outside or inside the vehicle at respective portions near the pillar mount members.
 4. The vehicle restraint apparatus as recited in claim 3, wherein the first link mechanism further includes a reinforcing jig which connects and reinforces the pillar mount members and which is adjustable in length, and the connecting jigs are connected with portions near both ends of the reinforcing jig.
 5. The vehicle restraint apparatus as recited in claim 4, wherein the reinforcing jig is attached to the pillar mount members in an adjustable manner to adjust a position of the reinforcing jig in a vehicle height direction. reinforcing jig.
 6. A vehicle restraint apparatus for restraining a vehicle on one or more rollers of a vehicle test system, the vehicle restraint apparatus comprising: a pair of vehicle restraining jigs having first ends connected with outside surfaces of left and right seatbelt fixing pillars of the vehicle and second ends joined with left and right poles on a floor.
 7. The vehicle restraint apparatus as recited in claim 6, wherein the first ends of the vehicle restraining jigs are connected rotatably with the outside surfaces of the left and right seatbelt fixing pillars in a vicinity of a center of gravity of the vehicle, through a first link mechanism, and the second ends of the vehicle restraining jigs are connected rotatably with the poles at positions substantially equal in height to the center of gravity of the vehicle, through a second link mechanism.
 8. The vehicle restraint apparatus as recited in claim 7, wherein the first link mechanisms comprises: a pair of pillar mount members attached to the outside surfaces of the left and right seatbelt fixing pillars, respectively; connecting shafts attached to outside surfaces of the pillar mount members; and connecting jigs mounted on the connecting shafts, respectively, and arranged to connect the vehicle restraining jigs rotatably in an omnidirectional manner rearwards outside the vehicle.
 9. The vehicle restraint apparatus as recited in claim 7, wherein the first link mechanisms comprises: a pair of pillar mount members attached to the outside surfaces of the left and right seatbelt fixing pillars, respectively; connecting shafts attached to outside surfaces of the pillar mount members at respective nearby rear positions on a rear side of the seatbelt fixing pillars; connecting jigs mounted on the connecting shafts, respectively, and arranged to connect the vehicle restraining jigs rotatably in an omnidirectional manner rearwards outside the vehicle; and a reinforcing jig which is disposed coaxially with the connecting shafts, which is arranged to connect and reinforce the pillar mount members and which is adjustable in length.
 10. The vehicle restraint apparatus as recited in claim 7, wherein the first link mechanisms includes a pair of pillar mount members attached to the outside surfaces of the left and right seatbelt fixing pillars, respectively, connecting shafts attached to inside surfaces of the pillar mount members at respective nearby rear positions on a rear side of the seatbelt fixing pillars, connecting jigs mounted on the connecting shafts, respectively, and arranged to connect the vehicle restraining jigs rotatably in an omnidirectional manner rearwards outside the vehicle; and a reinforcing jig which is connected with the connecting shafts, which is arranged to connect and reinforce the pillar mount members and which is adjustable in length.
 11. The vehicle restraint apparatus as recited in claim 7, wherein the first link mechanisms comprises: a pair of first pillar mount members attached to the outside surfaces of the left and right seatbelt fixing pillars, respectively; a pair of second pillar mount members attached to inside surfaces of the left and right seatbelt fixing pillars, respectively; connecting shafts clamped between the first pillar mount members and the second pillar mount members confronting the first pillar mount members, at respective nearby rear positions on a rear side of the seatbelt fixing pillars; connecting jigs mounted on the connecting shafts, respectively, and arranged to connect the vehicle restraining jigs rotatably in an omnidirectional manner rearwards outside the vehicle; and a reinforcing jig which is disposed coaxially with the connecting shafts, which is arranged to connect and reinforce the second pillar mount members and which is adjustable in length.
 12. The vehicle restraint apparatus as recited in claim 8, wherein the connecting shafts are adjustable for position adjustment in a vehicle height direction of the vehicle.
 13. The vehicle restraint apparatus as recited in claim 9, wherein the reinforcing jig is adjustable for position adjustment in a vehicle height direction of the vehicle.
 14. The vehicle restraint apparatus as recited in claim 1, wherein the poles are installed on the floor in an adjustable manner for position adjustment in at least one of a vehicle width direction, a vehicle length direction and a vehicle height direction of the vehicle.
 15. A vehicle restraint apparatus for restraining a vehicle having left and right rear seat doors, on one or more rollers of a vehicle test system, the vehicle restraint apparatus comprising: a pair of vehicle restraining jigs having first ends connected rotatably with left and right seatbelt fixing pillars of the vehicle in a vicinity of a center of gravity of the vehicle; a link mechanism connected with second ends of the vehicle restraining jigs in a rear seat interior space of the vehicle; and a pair of vehicle outside anchor devices disposed on a floor near the left and right rear seat doors of the vehicle, respectively, and arranged to support the link mechanism through openings of the rear seat doors.
 16. The vehicle restraint apparatus as recited in claim 15, wherein the link mechanism comprises: left and right attaching members disposed in confrontation in the rear seat interior space of the vehicle, and supported by the vehicle outside anchor devices, respectively; a first reinforcing jig connecting and reinforcing the left and right attaching members; and connecting jigs connecting the second ends of the vehicle restraining jigs rotatably at respective portions near both ends of first reinforcing jig.
 17. The vehicle restraint apparatus as recited in claim 16, wherein the link mechanism further comprises a second reinforcing jig connecting and reinforcing the left and right attaching members secondarily.
 18. The vehicle restraint apparatus as recited in claim 16, wherein the first reinforcing jig is attached to the left and right attaching members in an adjustable manner to adjust a position of the first reinforcing jig in a vehicle height direction of the vehicle.
 19. The vehicle restraint apparatus as recited in claim 15, wherein the vehicle outside anchor devices are disposed on the floor in an adjustable manner enabling position adjustment in at least one of a vehicle width direction, a vehicle length direction and a vehicle height direction of the vehicle.
 20. The vehicle restraint apparatus as recited in claim 28, wherein each vehicle restraining jig is provided with an adjusting mechanism to adjust a length of this vehicle restraining jig in a vehicle length direction of the vehicle.
 21. The vehicle restraint apparatus as recited in claim 28, wherein the vehicle restraint apparatus further comprises a restraining force sensor to sense a restraining force of the vehicle restraining jigs.
 22. The vehicle restraint apparatus as recited in claim 28, wherein the vehicle restraint apparatus further comprises a vibration damping device attached to one of the vehicle restraining jigs detachably and arranged to attenuate vibration of the vehicle restraining jig produced at a time of test of the vehicle with the vehicle test system.
 23. The vehicle restraint apparatus as recited in claim 22, wherein the vibration damping device comprises: an attachment member attached to the vehicle restraining jig detachably; an elastic member attached detachably to an outer side surface of a lower end portion of the attachment member; a length-adjustable shank portion having a first end attached to the elastic member detachably; and a weight portion which is attached detachably to a second end of the shank portion and which is adjustable in weight.
 24. The vehicle restraint apparatus as recited in claim 28, wherein the vehicle restraint apparatus further comprises a lateral vibration suppressing mechanism to suppress lateral vibration of the vehicle produced at a time of test of the vehicle with the vehicle test system.
 25. The vehicle restraint apparatus as recited in claim 24, wherein a plurality of the lateral vibration suppressing mechanisms are provided, respectively, at positions of front wheels of the vehicle on left and right sides of the vehicle and at positions of rear wheels of the vehicle on the left and right sides of the vehicle.
 26. The vehicle restraint apparatus as recited in claim 25, wherein each of the lateral vibration suppressing mechanisms comprises: a buffer member to abut elastically on a main body of the vehicle; a support member supporting the buffer member adjustably to adjust a position of the buffer member in a vehicle width direction of the vehicle; and a pillar portion to which the support member is attached.
 27. The vehicle restraint apparatus as recited in claim 26, wherein the pillar portion is installed in an adjustable manner to enable position adjustment in one of a vehicle width direction, a vehicle length direction and a vehicle height direction.
 28. A vehicle restraint apparatus for restraining a vehicle on at least one roller of a vehicle test system, the vehicle restraint apparatus comprising: a left vehicle restraining jig extending longitudinally from a first end to a second end and including the first end which is adapted to be connected with a left seatbelt fixing pillar of the vehicle for holding a seatbelt of the vehicle, and the second end which is adapted to be secured by an external left anchor device disposed outside the vehicle, and a right vehicle restraining jig extending longitudinally from a first end to a second end and including the first end which is adapted to be connected with a right seatbelt fixing pillar of the vehicle for holding a seatbelt of the vehicle and the second end which is adapted to be secured by an external right anchor device disposed outside the vehicle.
 29. The vehicle restraint apparatus as recited in claim 28, wherein the vehicle restraint apparatus further comprises: a first link mechanism to connect the first ends of the left and right vehicle restraining jigs with the left and right seatbelt fixing pillars, respectively, at left and right front connection points positioned to minimize a difference in height from a center of gravity of the vehicle; and a second link mechanism to anchor the second ends of the left and right vehicle restraining jigs to the left and right external anchor devices, respectively, by holding the second ends of the left and right vehicle restraining jigs, respectively, at left and right rear connection points positioned to minimize a difference in height from the center of gravity of the vehicle.
 30. The vehicle restraint apparatus as recited in claim 29, wherein the first link mechanism comprises: a pair of pillar mount members adapted to be fixed to the left and right seatbelt fixing pillars, respectively; and connecting jigs adapted to be supported by the pillar mount members, respectively and to be connected, respectively, with the first ends of the left and right vehicle restraining jigs at the left and right front connection points.
 31. The vehicle restraint apparatus as recited in claim 30, wherein each of the connecting jigs includes a joint to allow rotation of the first end of a corresponding one of the vehicle restraining jigs.
 32. The vehicle restraint apparatus as recited in claim 29, wherein the first link mechanism is arranged to adjust the left and right front connection points in a vehicle height direction of the vehicle to minimize the difference in height between the center of gravity of the vehicle and each of the left and right front connection points.
 33. The vehicle restraint apparatus as recited in claim 28, wherein the external left anchor device is one of a left pole installed on a floor of the vehicle test system and a left vehicle outside anchor device installed on the floor of the vehicle test system on a left side of the vehicle on the at least one roller, and the external right anchor device is one of a right pole installed on the floor of the vehicle test system and a right vehicle outside anchor device installed on the floor of the vehicle test system on a right side of the vehicle on the at least one roller. 